Membership - What does this error mean: Total Occurrences must be less than or equal to 9999

Hello, Each time a new user tries to complete the payment for a membership plan they are presented with an error code at the top of the page "Total Occurrences must be less than or equal to 9999." and are NOT redirected to the "thank you" page.

However, the user DOES get charged each time they press the "process payment" button.

Can you guys please clarify what the error is and how to fix it?

Currently the subscript plan is set to:
- Mode = Serial
- Period =1 month(s)
- Price 9.95

Running the latest version of Memberships Pro

I've also attached screenshots.